1#ifndef __LINUX_PAGEISOLATION_H
2#define __LINUX_PAGEISOLATION_H
3
4#ifdef CONFIG_MEMORY_ISOLATION
5static inline bool has_isolate_pageblock(struct zone *zone)
6{
7	return zone->nr_isolate_pageblock;
8}
9static inline bool is_migrate_isolate_page(struct page *page)
10{
11	return get_pageblock_migratetype(page) == MIGRATE_ISOLATE;
12}
13static inline bool is_migrate_isolate(int migratetype)
14{
15	return migratetype == MIGRATE_ISOLATE;
16}
17#else
18static inline bool has_isolate_pageblock(struct zone *zone)
19{
20	return false;
21}
22static inline bool is_migrate_isolate_page(struct page *page)
23{
24	return false;
25}
26static inline bool is_migrate_isolate(int migratetype)
27{
28	return false;
29}
30#endif
31
32bool has_unmovable_pages(struct zone *zone, struct page *page, int count,
33			 bool skip_hwpoisoned_pages);
34void set_pageblock_migratetype(struct page *page, int migratetype);
35int move_freepages_block(struct zone *zone, struct page *page,
36				int migratetype);
37int move_freepages(struct zone *zone,
38			  struct page *start_page, struct page *end_page,
39			  int migratetype);
40
41/*
42 * Changes migrate type in [start_pfn, end_pfn) to be MIGRATE_ISOLATE.
43 * If specified range includes migrate types other than MOVABLE or CMA,
44 * this will fail with -EBUSY.
45 *
46 * For isolating all pages in the range finally, the caller have to
47 * free all pages in the range. test_page_isolated() can be used for
48 * test it.
49 */
50int
51start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
52			 unsigned migratetype, bool skip_hwpoisoned_pages);
53
54/*
55 * Changes MIGRATE_ISOLATE to MIGRATE_MOVABLE.
56 * target range is [start_pfn, end_pfn)
57 */
58int
59undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
60			unsigned migratetype);
61
62/*
63 * Test all pages in [start_pfn, end_pfn) are isolated or not.
64 */
65int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn,
66			bool skip_hwpoisoned_pages);
67
68/*
69 * Internal functions. Changes pageblock's migrate type.
70 */
71int set_migratetype_isolate(struct page *page, bool skip_hwpoisoned_pages);
72void unset_migratetype_isolate(struct page *page, unsigned migratetype);
73struct page *alloc_migrate_target(struct page *page, unsigned long private,
74				int **resultp);
75
76#endif
77